AutoCodes – Chevrolet – P119A 2016 Chevrolet Silverado

P119A 2016 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P119A 2016 Chevrolet Silverado indicates NOx Sensor 1 Signal Circuit.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 186

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P119A 2016 Chevrolet Silverado Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P119A 2016 Chevrolet Silverado - NOx Sensor 1 Signal Circuit - AutoCodes.com — P119A 2016 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P119A 2016 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P119A 2016 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P119A 2016 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P119A 2016 Chevrolet Silverado code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P119A 2016 Chevrolet Silverado Code

1. What does the OBDII code P119A mean on a 2016 Chevrolet Silverado?

P119A indicates an issue with the NOx Sensor 1 Signal Circuit, specifically a fault in the sensor's signal communication or functionality.

2. What are the symptoms of the P119A code on a 2016 Chevrolet Silverado?

Common symptoms include reduced engine performance, the check engine light turning on, increased emissions, and potentially poor fuel economy.

3. What causes the P119A code on a 2016 Chevrolet Silverado?

The code can be caused by a faulty NOx sensor, damaged wiring or connectors in the NOx sensor 1 circuit, software issues in the ECM, or excessive carbon buildup in the exhaust.

4. Can I drive my 2016 Chevrolet Silverado with the P119A code?

While the vehicle may still be drivable, continuing to drive with this code can lead to increased emissions and potential long-term damage to the exhaust system.

5. How do I diagnose the P119A code on a 2016 Chevrolet Silverado?

Diagnosis involves using a scan tool to confirm the code, inspecting the NOx sensor wiring and connectors for damage, and testing the sensor's functionality with a multimeter or other tools.

6. How do I fix the P119A code on a 2016 Chevrolet Silverado?

Possible fixes include replacing the faulty NOx sensor, repairing damaged wiring or connectors, and updating or reprogramming the ECM if necessary.

7. How much does it cost to repair the P119A code on a 2016 Chevrolet Silverado?

Repair costs vary but typically range from $300 to $800, depending on whether the NOx sensor needs replacement or if wiring repairs are required.

8. Can a bad NOx sensor cause other problems in a 2016 Chevrolet Silverado?

Yes, a bad NOx sensor can affect engine efficiency, trigger other codes, and potentially damage the catalytic converter over time.

9. How can I prevent the P119A code from occurring again on my 2016 Chevrolet Silverado?

Regular maintenance, including keeping the exhaust system clean and inspecting wiring for damage, can help prevent this code from reappearing.

10. Is the P119A code covered under warranty for a 2016 Chevrolet Silverado?

It depends on your vehicle's warranty coverage and mileage. Some emissions-related components, such as the NOx sensor, may be covered under an extended emissions warranty.